Impact of Multivariate Background Error Covariance on the WRF-3DVAR Assimilation for the Yellow Sea Fog Modeling

Joint Authors

Gao, Xiaoyu
Gao, Shanhong

Source

Advances in Meteorology

Issue

Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-19, 19 p.

Publisher

Hindawi Publishing Corporation

Publication Date

2020-11-10

Country of Publication

Egypt

No. of Pages

19

Main Subjects

Physics

Abstract EN

Numerical modeling of sea fog is highly sensitive to initial conditions, especially to moisture in the marine atmospheric boundary layer (MABL).

Data assimilation plays a vital role in the improvement of initial MABL moisture for sea fog modeling over the Yellow Sea.

In this study, the weather research and forecasting (WRF) model and its three-dimensional variational (3DVAR) data assimilation module are employed for sea fog simulations.

Two kinds of background error (BE) covariances with different control variables (CV) used in WRF-3DVAR, that is, CV5 and multivariate BE (CV6), are compared in detail by explorative case studies and a series of application experiments.

Statistical verification metrics including probability of detection (POD) and equitable threat scores (ETS) of forecasted sea fog area are computed and compared for simulations with the implementations of CV5 and CV6 in the WRF-3DVAR system.

The following is found: (1) there exists a dominant negative correlation between temperature and moisture in CV6 near the sea surface, which makes it possible to improve the initial moisture condition in the MABL by assimilation of observed temperature; (2) in general, the performance of the WRF-3DVAR assimilation with CV6 is distinctly better, and the results of 10 additional sea fog cases clearly suggest that CV6 is more suitable than CV5 for sea fog modeling.

Compared to those with CV5, the average POD and ETS of forecasted sea fog area using 3DVAR with CV6 can be improved by 27.6% and 21.0%, respectively.

American Psychological Association (APA)

Gao, Xiaoyu& Gao, Shanhong. 2020. Impact of Multivariate Background Error Covariance on the WRF-3DVAR Assimilation for the Yellow Sea Fog Modeling. Advances in Meteorology،Vol. 2020, no. 2020, pp.1-19.
https://search.emarefa.net/detail/BIM-1127058

Modern Language Association (MLA)

Gao, Xiaoyu& Gao, Shanhong. Impact of Multivariate Background Error Covariance on the WRF-3DVAR Assimilation for the Yellow Sea Fog Modeling. Advances in Meteorology No. 2020 (2020), pp.1-19.
https://search.emarefa.net/detail/BIM-1127058

American Medical Association (AMA)

Gao, Xiaoyu& Gao, Shanhong. Impact of Multivariate Background Error Covariance on the WRF-3DVAR Assimilation for the Yellow Sea Fog Modeling. Advances in Meteorology. 2020. Vol. 2020, no. 2020, pp.1-19.
https://search.emarefa.net/detail/BIM-1127058

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references

Record ID

BIM-1127058